Bob wishes to insure a priceless family heirloom against theft. The annual premium for policy A is $150, and it will pay $75,000 if the heirloom is stolen. Policy B will pay $100,000, but the annual premium for policy B is $250. Bob estimates the probability that the heirloom will be stolen in any given year and remains undecided between the two policies (that is the expected values are the same between the two policies). What is this estimated probability? Express your answer as a decimal.